S&S Cycle Power Tune XTO EPA Compliant Exhaust for UTV 550-1037High flow 304 stainless steel muffler body Dual exhaust outlets have stylized tips Improved power and torque Each exhaust outlet has removable spark arrestors and can accept tunable inserts so you can quickly and easily tune for power and torque along with tone and decibel levels Fit with or without factory rear cover Does not require ECU tuning All systems come with 1. 5in. inserts Meets J335 Forestry Standards XTO muffler tuning inserts sold